Chemistry-An Asian Journal
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2020
·Vol. 15
·期 9
·1456-1463
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IF 4.056
Xiaolian Huang,Shuang Men,Hui Zheng,Dong-Dong Qin,Xiongwu Kang
Graphical NiCoSe 4 microspheres derived from NiCo-MOFs display excellent electrochemical performance as anode materials for sodium-ion batteries. Binary transition metal selenides have been more promising than single transition metal selenides as anode materials for sodium-ion batteries (SIBs). However, the controlled synthesis of transition metal selenides, especially those derived from metal-organic-frameworks with well-controlled structure and morphology is still challenging. In this paper, highly porous NiCoSe 4 @NC composite microspheres were synthesized by simultaneous carbonization and selenization of a Ni−Co-based metal-organic framework (NiCo-MOF) and characterized by scanning electron microscopy, transition electron microscopy, X-Ray diffraction, X-Ray photoelectron spectroscopy and electrochemical techniques. The rationally engineered NiCoSe 4 @NC composite exhibits a capacity of 325 mAh g −1 at a current density of 1 A g −1 , and 277.8 mAh g −1 at 10 A g −1 . Most importantly, the NiCoSe 4 @NC retains a capacity of 293 mAh g −1 at 1 A g −1 after 1500 cycles, with a capacity decay rate of 0.025 % per cycle.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Keqiang Xu,Xiaoping Shen,Zhenyu Yan,Zhenyuan Ji,Aihua Yuan,Guoxing Zhu,Lirong Kong,Jun Zhu,Baolong Li
Tin (Sn)-based anodic materials have attracted tremendous attention in lithium-ion batteries (LIBs) owing to their high theoretical capacity and low potential (0.5 V versus Li/Li + ). However, Sn-based anodic materials usually suffer from serious structural collapse and large volume expansion. To overcome this obstacle, herein, a dual-buffer structure of tin-cobalt (Sn-Co) alloy-based nanocomposite was designed through thermal annealing of a cyanometallic framework. The inactive Co acts as robust framework to buffer the volume expansion of Sn-Co alloy nanoparticles , and the reduced graphene oxide (rGO) matrix can reduce the aggregation of Sn-Co nanoparticles as well as alleviate the structure collapse of electrode during long-term cycling. As LIBs anodes, the Sn-Co/rGO composites exhibit a high reversible capacity (1055 mAh g −1 at 0.2 A g −1 after 250 cycles), good rate capability (320 mAh g −1 at 5 A g −1 ), and outstanding long-term cycling performance (720 mAh g −1 at 1 A g −1 after 600 cycles). When coupled with LiFePO 4 , the full battery can also display high electrochemical performance in terms of discharge capacity and cyclic stability.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Weiwei Kang,Yan Cui,Lei Qin,Yongzhen Yang,Zongbin Zhao,Xuzhen Wang,Xuguang Liu
Recently, graphene aerogels (GAs) have attracted considerable research attention in oil/water separation owing to their remarkable properties. However, the serious stacking of graphene oxide nanosheets (GO) would lead to low adsorption capacity and poor recyclability. For the first time, with alkaline ammonium citrate as reducing agent and nitrogen source, the point-to-face contact between magnetic carbon nanospheres (MCNS) and graphene sheets was adopted to effectively inhibit the aggregation of graphene sheets. Nitrogen-doped magnetic carbon nanospheres/graphene composite aerogels (MCNS/NGA) were fabricated under weakly alkaline conditions by one-step hydrothermal in-situ electrostatic self-assembling strategy. The aerogels have low density, super-elasticity (up to 95 % compression), high specific surface area (787.92 m 2 g −1 ) and good magnetic properties. Therefore, they exhibit adsorption capacity in the range of 187–537 g g −1 towards various organic solvents and oils, superior to most reported materials to date. In addition, thanks to their good mechanical properties, excellent thermal stability and flame retardancy, they can be regenerated by squeezing, distillation and combustion. More importantly, magnetic control technology can be adopted to realize oriented adsorption and facilitate recycling of organic solvents and oils in extreme environments.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
·
IF 4.706
Muthuchamy Maruthupandy,Pan Qin,Thillaichidambaram Muneeswaran,Govindan Rajivgandhi,Franck Quero,Ji-Ming Song
Highly pure zinc oxide nanoparticles (ZnO NPs) and graphene-zinc oxide nanocomposites (G-ZnO NCs) were synthesized via chemical precipitation method. The structure, morphology, and composition of the synthesized ZnO NPs and G-ZnO NCs were characterized by using fourier transfer infrared spectroscopy, X-ray diffraction spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy (TEM). The TEM images revealed that the diameter of ZnO NPs is 8–12 nm and homogeneously dispersed onto the surface of graphene sheets. The photocatalytic degradation efficiency of the synthesized G-ZnO NCs against rhodamine-B (Rh-B), methylene blue (MB) and methyl orange (MO) was quantified under visible light irradiation. The irradiation time required for complete removal of the dyes are dependent on dye molecules (MB, MO and Rh-B) and their interaction with the prepared ZnO NPs and G-ZnO NCs. The synthesized NCs were highly efficient for the removal of Rh-B compared to other tested dyes. Hence, the synthesized G-ZnO NCs could be used for environmental dye remediation.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2020
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IF 5.647
Shuai Chen,Zixiang Li,Carolina Belver,Guilan Gao,Jie Guan,Yaoguang Guo,Hui Li,Jiao Ma,Jorge Bedia,Patryk Wójtowicz
Zero valent iron/carbon composites were successfully synthesized from commercial iron oxide and graphite (ZVI/C) and also by using graphite obtained from spent Li-ion batteries and iron oxide from mill scale (ZVI/C-X) as a new approach for the valorization of these waste. The composites were synthesized through carbothermic reactions and tested as catalysts for the degradation of ibuprofen from water by Fenton reaction . The optimal conditions for synthesizing ZVI/C composites were a temperature of 1000 °C maintained for 2 h. The structural, and textural features of ZVI/C with different ZVI mass ratios were characterized by different techniques. ZVI/C composites with higher ZVI mass ratios showed higher degradation rates for the removal of ibuprofen both in presence and absence of H 2 O 2 . Moreover, ZVI/C-X composite, obtained from industrial waste, showed activity even after four consecutive cycles of use with very low concentration of iron ions in solution after reaction (4.8 mg L −1 after 4 h), which supports the high stability and low Fe-lixiviation of ZVI/C-X composite. The results of this study prove the possibility of synthesizing composites using graphite from spent Li-ion batteries and iron oxide from mill scale, and their potential for the degradation of ibuprofen in water, with comparable activities to those obtained from commercial feedstocks .
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 16
·6428-6434
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IF 3.288
Chang Dong,Yijia Yu,Xiaoling Zhang,Liyan Huang,Ying Wu,Jun Li,Zhengping Liu
Ionic liquids (ILs) with wide electrochemical windows are increasingly used as electrolytes to improve the energy density of graphene-based supercapacitors. However, due to irreversible agglomeration during the reduction of graphene oxide (GO) to reduced graphene oxide (RGO) and less compatibility between the IL electrolyte and RGO, RGO-based electrode materials in an IL electrolyte usually exhibit poor electrochemical properties. To address these issues, we chose an ionic liquid with a similar structure to the electrolyte as a modifier and fabricated reduced graphene oxide composites modified with the chosen ionic liquid (RGO–IL) by a hydrothermal method. The integration of ILs with RGO could prevent the aggregation and restacking of GO layers and improve the compatibility between the RGO–IL electrode and IL electrolyte. The symmetrical supercapacitor assembled using the obtained RGO–IL2 electrode material showed an outstanding energy density (50.19 W h kg−1 at 0.75 kW kg−1) and excellent cycle performance (87.23% retention of the original value after 2000 cycles at 5 A g−1) in the IL electrolyte. These superior performances make RGO–IL composites one of the apposite choices of electrode materials for supercapacitors.
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CHEMICAL PHYSICS LETTERS
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2020
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IF 2.029
Yuchuan Liu,Zongxue Yu,Yixin Peng,Liangyan Shao,Xiuhui Li,Haojie Zeng
The graphene-based film is an interlayer separation film having a special mass transfer property. In this study, a novel TiO 2 nanorod inserted graphene-based membrane on a CA (Cellulose Acetate) mat was fabricated by a vacuum filtration method for water treatment application. The intercalated TiO 2 nanorods expanded the interlamellar spacing among the graphene sheets and thus advanced the separation efficiency of graphene-based membrane, which exhibited a flux several times higher than some commercial nanofiltration membranes and an extremely high rejection especially for dyes, for MB (99.3%), Rhb (99.4%), MO (99.3%), CR (99.6%).
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CHINESE JOURNAL OF CHEMISTRY
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2020
·Vol. 38
·期 10
·1123-1131
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IF 3.826
Liu Yang,Tao Wang,Dongling Wu
Summary of main observation and conclusion Heteroatom-doped carbon materials have been widely used in energy storage and conversion such as supercapacitors and electrocatalysts. In this work, L -asparagine (Asn), an amino acid derivative, has been used as a doping agent to prepare nitrogen- doped reduced graphene oxide gels (N-GAs). The 3D interconnected structure gives rise to the superior electrochemical properties for supercapacitor and electrocatalytic oxygen reduction reaction (ORR). The N-GA-4 (the mass ratio of Asn to graphene oxide (GO) is 4 : 1 by hydrothermal method) electrode shows the capacitance of 291.6 F·g –1 at 0.5 A·g –1 . Meanwhile, the assembled symmetric supercapacitor achieves a maximum energy density of 23.8 Wh· kg –1 when the power density is 451.2 W·kg –1 , and demonstrates an ultralong cycling life that the retention of capacitance is 99.3% after 80000 cycles. What's more, the annealed aerogel N-GA-4-900 exhibits an onset potential ( E onset ) of 0.95 V, half wave potential ( E 1/2 ) of 0.84 V (vs. RHE) and the oxygen reduction current density of 5.5 mA·cm –2 at 0.1 V with nearly four-electron transfer, which are superior to commercial Pt/C. This work offers a new insight into the synthesis and applications of N-GAs materials towards high performance in supercapacitors and ORR.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ning Wei,Xudong Zheng,Qiao Li,Chenxia Gong,Hongxiang Ou,Zhongyu Li
Metal organic framework materials (MOFs) are kinds of hybrid materials with intra-molecular pores formed by self-assembly of organic ligands and metal ions through coordination bonds. In the paper, a type of MOFs named as [Zn(μ-L)(μ-1,3-dpp)](mof-1), using Zn 2+ as metal ions, 4,4′-oxybis(benzoic acid) and 1,3-di(4-pyridyl)propane as organic ligands was synthesized. The rare earth element lanthanum , which has specific adsorption for phosphorus, is intercalated into mof-1 by the impregnation method in order to remove phosphorus-containing wastewater. In order to optimize the nano-sized La-mof-1 materials to facilitate separation, we prepared a membrane by blending MOFs materials with graphene oxide (GO) by pressure application. The addition of GO not only facilitates the separation of materials, but also has excellent removal ability for water purification . After a series of structural characterization, the adsorption properties of materials were tested. The experimental results showed that the total phosphorus in the water can get to the maximum adsorption capacity when pH = 4.0. It can be viewed in thermodynamic studies that increasing the temperature favors the adsorption reaction. Increasing the temperature to the 318 K, the equilibrium adsorption capacity of the membrane to total phosphorus in the water reached 139.51 mg/g. The adsorption removal rate of total phosphorus can reach 100% when its concentration is lower than 100 mg/L. This highlights the advantages of intercalating lanthanum into MOFs. The penetration curve was drawn by dynamic adsorption experiments to understand the mass transfer mechanism of La-mof-1GO membrane. Since GO also has a large specific surface area, it is another excellent adsorption material. Experimental data showed that compared with the original water sample, the removal rate of COD in the water reached 73.9%.
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Frontiers of Environmental Science & Engineering
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2020
·Vol. 14
·期 2
·1-11
·
IF 4.053
Guo Xingguo,Wang Qiuying,Xu Ting,Wei Kajia,Yin Mengxi,Liang Peng,Huang Xia,Zhang Xiaoyuan
Developing high activity, low-cost and long durability catalysts for oxygen reduction reaction is of great significance for the practical application of microbial fuel cells. The full exposure of active sites in catalysts can enhance catalytic activity dramatically. Here, novel Fe-N-doped graphene is successfully synthesized via a one-step in situ ball milling method. Pristine graphite, ball milling graphene, N-doped graphene and Fe-N-doped graphene are applied in air cathodes, and enhanced performance is observed in microbial fuel cells with graphene-based catalysts. Particularly, Fe-N-doped graphene achieves the highest oxygen reduction reaction activity, with a maximum power density of 1380±20 mW/m 2 in microbial fuel cells and a current density of 23.8 A/m 2 at −0.16 V in electrochemical tests, which are comparable to commercial Pt and 390% and 640% of those of pristine graphite. An investigation of the material characteristics reveals that the superior performance of Fe-N-doped graphene results from the full exposure of Fe 2 O 3 nanoparticles, pyrrolic N, pyridinic N and excellent Fe-N-G active sites on the graphene matrix. This work not only suggests the strategy of maximally exposing active sites to optimize the potential of catalysts but also provides promising catalysts for the use of microbial fuel cells in sustainable energy generation.
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SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Jiang Hu,Jundong Zhu,Shengzhuo Ge,Chongwen Jiang,Tianyu Guo,Tangping Peng,Tao Huang,Le Xie
Three-dimensional aerogels with hydrophobic and lipophilic properties have attracted wide attention in the effective cleaning of oil-spills. However, cost-effectiveness, biodegradability, and recycling are still challenging in the application of aerogels for oil-water separation. In this paper, we have prepared high biocompatibility, low cost, and hydrophobic composite aerogels (WCA = 148°) through directional freezing-drying technology by using chitosan (CS) as the skeleton substrate, reduced graphene oxide nanosheets (rGO) as enhancements and hydrophobic silicon particles/polydimethylsioxane (H-SiO 2 /PDMS) as the hydrophobic modifier. The composite aerogel prepared has good adsorption capacity (18–45 g/g), good chemical and thermal stability in a harsh environment. More importantly, the adsorbed organic solvents and oils adsorbed can be easily extruded from aerogels due to its excellent compressive properties. In addition, adsorption rate for pump oil and silicone oil is accelerated with the increase of temperature. The adsorption kinetics of aerogel on silicone oil and pump oil can be well fitted by pseudo-first order kinetic equation.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 2
·1-9
·
IF 6.232
Sun Huiyuan,Liu Xueliang,Wang Xinhuan,Han Qiusen,Qi Cui,Li Yanmei,Wang Chen,Chen Yongxiang,Yang Rong
The authors describe a peroxidase-mimicking nanozyme composed of IrO 2 and graphene oxide (GO). It was synthesized from monodisperse IrO 2 nanoparticles with an average diameter of 1.7 ± 0.3 nm that were prepared by pulsed laser ablation in ethanol. The nanoparticles were then placed on polyallylamine-modified GO nanosheets through electrostatic interaction. The peroxidase-like activity of the resulting nanocomposites was evaluated by catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H 2 O 2 . Kinetic results demonstrated that the catalytic behavior of the nanocomposites follows Michaelis-Menten kinetics. Experiments performed with terephthalic acid and cytochrome C confirmed that the peroxidase-like activity originated from the electron transfer mechanism rather than from generation of hydroxy radicals. The peroxidase-like activity is inhibited in the presence of ascorbic acid (AA). Based on this property, a colorimetric assay was developed for the determination of AA by exploiting the peroxidase-like activity of IrO 2 /GO nanocomposites. The linear relationship between absorbance at 652 nm and the concentration of AA was acquired. The limit of detection for AA is 324 nM. Further applications of the method for AA detection in real samples were also successfully demonstrated.
Schematic of the preparation of polyallylamine (PAH)-stabilized IrO 2 /GO nanocomposites and the colorimetric detection of AA based on the peroxidase-like activity of IrO 2 /GO nanocomposites.
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